<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="./css/style2.css"/>
</head>
<body>
<button class="btn_white alive">白色</button>
<button class="btn_white btn_mid alive">白色</button>
<button class="btn_white btn_big alive">白色</button>
<button class="btn_white btn_biger alive">白色</button>
<hr/>
<button class="btn_black alive">黑色</button>
<button class="btn_black btn_mid alive">黑色</button>
<button class="btn_black btn_big alive">黑色</button>
<button class="btn_black btn_biger alive">黑色</button>
<hr/>
<button class="btn_pink alive">粉色</button>
<button class="btn_pink btn_mid alive">粉色</button>
<button class="btn_pink btn_big alive">粉色</button>
<button class="btn_pink btn_biger alive">粉色</button>
<hr/>
<button class="btn_blue alive">蓝色</button>
<button class="btn_blue btn_mid alive">蓝色</button>
<button class="btn_blue btn_big alive">蓝色</button>
<button class="btn_blue btn_biger alive">蓝色</button>
</body>
</html>